what kind of utility can be built for System testing?

I can't think of a utility that i could use java to build that would help facilitate a tester..... maybe some kind of tracking system to keep track of test cases,etc any ideas? has anyone built a ulitity used in testing?

JUnit (and the other *unit tools) are very good for developers testing individual classes for results that match very technical design expectations. You can collect tests into suites to run and report a bunch at once.

Fit/FitNesse are good tools for users and developers testing larger parts of the system for results that match business expectations. Again you can build up any number of tests into test suites.

There are many other tools that fit where these don't quite ... unit testing for XML or HTTP, Selenium for user interface, etc.